<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
      let a = [1,2,3,2,4,5,6,4]
      a.forEach ( ( item)=>{
       document.write(item)
      })
    </script>
</body>
</html>